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The Phase Diagram of Correlated Electrons in a Lattice of Berry Molecules

Giuseppe Santoro·Marco Airoldi·Nicola Manini·Erio Tosatti·Alberto Parola
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Abstract

A model for correlated electrons in a lattice with local additional spin--1 degrees of freedom inducing constrained hopping, is studied both in the low density limit and at quarter filling. We show that in both 1D and 2D two particles form a bound state even in presence of a repulsive U<U_c. A picture of a dilute Bose gas, leading to off-diagonal long range order (LRO) in 2D (quasi-LRO in 1D), is supported by quantitative calculations in 1D which allow for a determination of the phase diagram.

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Giuseppe Santoro, Marco Airoldi, Nicola Manini, Erio Tosatti, Alberto Parola. 2000-05-30. The Phase Diagram of Correlated Electrons in a Lattice of Berry Molecules. https://doi.org/10.1103/physrevlett.74.4039

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